Parents
Siblings
1884
Apr 20
| 1884 • The Stefan-Boltzmann law is reformulated by Ludwig Boltzmann. |
1900
Age: 15y
| 1900 • U.S. Secretary of State John Hay announces the Open Door Policy to promote American trade with China. |
1918
Sep 12
Age: 34y
| 1918 • Start of 3-day Lwów pogrom: Polish troops, volunteers and freed criminals massacre at least 320 Ukrainian Christians and Jews in Lwów in Galicia. |
1930
Age: 45y
| 1930 • Princess Margaret Rose is born at Glamis Castle in Scotland, younger daughter of Prince Albert, Duke of York (second son of King George V and Queen Mary, and later King George VI) and Elizabeth, Duchess of York, and sister to The Princess Elizabeth. |
1963
Jun
Age: 79y
| 1963 • Leonardo da Vinci's Mona Lisa is exhibited in the United States for the first time, at the National Gallery of Art in Washington, D.C.. |